Skoda Supercritical Steam Turbine 660 MW

Transcription

1 Skoda Supercritical Steam Turbine 660 MW Jiri Fiala Head of Engineering Dept. Skoda Power s.r.o. 27th of October 2010 Vrnjacka Banja - Serbia

2 ŠKODA History Establishment of the company in 1859 Mr. Emil Škoda, founder of Škoda Works

3 ŠKODA History Eminent personalities in the history of ŠKODA steam turbines Prof. Auguste Rateau First steam turbine produced by ŠKODA Works in 1904 Prof. Aurel Stodola

4 History Slide with Timeline and Key Milestones First steam turbine 550 HP system Rateau Turbines or the Rateau system were replaced by turbines of ŠKODA s own design Two 23 MW steam turbines with steam reheating Turboset 110 MW Turboset 200 MW Turboset 220 MW for nuclear power plant Turboset 500 MW Turboset 1000 MW for nuclear power plant USC unit 660 MW for Ledvice Power Plant Company Doosan Heavy Industries & Construction has completed the acquisition s.r.o. and established s.r.o., A Doosan company

5 ULTRASUPERCRITICAL UNITS

6 Comparison of parameters 47,0% 46,0% nett efficiency 45,0% 44,0% 43,0% 42,0% vacuum: bar 250 bar 540 C 560 C 250 bar 566 C 566 C 270 bar 580 C 600 C 285 bar 600 C 620 C 41,0% 167 bar 538 C 538 C 40,0% 39,0%

7 Steam parameters development

8 Project information Power Plant Ledvice, Czech Republic: Client: CEZ Czech Republic EPC : Skoda Praha Invest Main Deliveries: Boiler Alstom Coal - lignite heat content 11 MJ/kg, consumption 460 t/h Steam Turbine SKODA Power type MTD 70 Live steam 265 bars, temp. 597 C/606 C

9 Project information Škoda Power scope: Condensing turbine MTD MW Generator with excitation system Condensers LP and HP feed water heating systems All interconnecting piping, armatures Control system, instrumentations Lube oil system By-passes DWH system TG foundation

10 HBD 660 MW 100% / 18,5 C

11 Škoda steam turbine design Turbine arrangement : 1xHP, 1x double flow IP, 2x double flow LP Length of turbine mm Weight incl. main valves approx t

12 Škoda steam turbine design Concept of USC Steam Turbine ŠKODA Design Reliability: new USC turbine 660 MW is derived from successful and proven design of 500 MW configuration is identical / USC turbine takes over the majority of modules High steam temperature is enabled by application of modern heat resisting materials Suppliers of basic components rotor forgings, turbine casings, forgings and castings for turbine valves, material for blades are leading European companies with references from USC units Vallourec-Mannesmann, Saarschmiede, Alstom, Böhler

13 Basic Parameters of USC Turbine ŠKODA 660 MW Live Steam Pressure / before HP ES valves 27,3 / 26,5 MPa Live Steam Temperature- Boiler / before HP ES valves 600 / 597 C Steam Flow nominal 468 kg/s (1685 t/h) Reheat Steam Temperature boiler outlet / before IP valves 610 / 606,5 C Cooling Water nominal temperature 18,5 C Electrical Output 660 MW Speed 3000 rpm Thermal Efficiency of Turbine Cycle 51,5 % η tdi HP / IP / LP 92,5 / 94,6 / 92%

14 Materials of Main turbine Components G-X12CrMoVNbN9-1 T671 H950 X14CrMoVNbN NiCrMoV15-6 Bolts parting Plane Inconel 718 Blades Böhler T550 / Böhler T505SC Piping P92 / P91

15 Materials of Main turbine Components Moving blades HP part Böhler T 550 Extra Re > 600 MPa Rm 800 to 950 MPa IP part Böhler T 505SC Re > 750 MPa Rm 870 to 1020 MPa LP part X12Cr13 mod. Re > 490 MPa Rm 650 to 800 MPa LP part L-0 Böhler T 671 H950 Re > 1103 MPa Rm > 1172 MPa Turbine rotors HP rotor COST F Re > 700 MPa Rm 800 to 950 MPa IP rotor COST F Re > 700 MPa Rm 800 to 950 MPa LP rotors 27NiCrMoV15-6 Re > 700 MPa Rm 850 to 1000 MPa Main steam valve chambers HP valves G-X12CrMoVNbN 9 1 Re > 450 MPa Rm 620 to 850 MPa IP valves G-X12CrMoVNbN 9 1 Re > 450 MPa Rm 620 to 850 MPa

16 Four casing configuration High pressure casing 1 x HP single flow (10 stages) Bearing span 5300 mm Weight 122 t

17 Four casing configuration High pressure casing

18 Four casing configuration Intermediate pressure casing 1 x IP double flow (2 x 8 stages) Bearing span 5450 mm Weight 154 t

19 Four casing configuration Intermediate pressure casing

20 Four casing configuration Low pressure casing 2 x LP double flow (4 x 5 stages) Bearing span 8250 mm Weight 2 x 370 t

21 Four casing configuration LP rotor solid forged Weight 80 t

22 Four casing configuration Last stage moving blade Material T 671 Length 1085 mm (42 )

23 Four casing configuration LP casing steam inlet

24 Main steam valves HP control and stop valve two chambers / left and right / alongside HP casing Valve body material P91 Basic material of inner parts P91, P92 Stop valve balanced type Control valves valve unbalanced type Graphite spindle sealing

25 Main steam valves LP control and intercept valve IP Interception and Control Valves - four combined valves - two on each side of IP turbine Valve body material P91 Basic materials of inner parts P91, X22CrMoV Intercepting and control valve balanced Graphite Chesterton spindle sealing

26 Main steam valves

27 Turbine journal bearings Diameter [mm] Front HP Rear HP Front IP Rear HP Front LP1 Rear LP1 Front LP2 Rear LP2 Ø 300 Ø 400 Ø 400 Ø 500 Ø 560 Ø 560 Ø 560 Ø 560

28 ŠKODA USC 660 MW UNIT MAIN DATA OF MACHINE HALL: Whole length of TG 59,7 m (incl. space for gen. rotor assy) TG elevation 15,00 m (TG centr. 16,3 m) Machine hall dimension cca 39 x 90 m Main machine hall elevation + 15,00 m, + 6,00 m (heaters), ± 0,00 m, - 4,50 m TG foundation No. of springs (GERB) with spring supported upper slab 142 pcs

29 ŠKODA USC 660 MW UNIT TG foundation

30 ŠKODA USC 660 MW UNIT TG foundation

31 ŠKODA USC 660 MW UNIT Checking point of foundation

32 ŠKODA USC 660 MW UNIT GENERATOR

33 ŠKODA USC 660 MW UNIT GENERATOR Stator weight Rotor weight 316 t 75 t

34 ŠKODA USC 660 MW UNIT GENERATOR

35 ŠKODA USC 660 MW UNIT Main steam condensers: No. of pieces for unit 2 Type of condenser surface, single path Heat transfer area 2 x m² Tubing number pcs dimensions Ø 22,0 x 0,70 x mm material ss Condenser superstructure LP by pass damp tubes LPH No. 1 (condenser 1) LPH No. 2 (condenser 2) Cooling water flow kg/s Evacuation 3 x 50% - water ring pumps Ball continuous sponge cleaning system

36 ŠKODA USC 660 MW UNIT Main condenser - tubes

37 ŠKODA USC 660 MW UNIT Main condenser

38 ŠKODA USC 660 MW UNIT LP heater for placing into condenser neck

39 ŠKODA USC 660 MW UNIT LP heater placed in condenser neck

40 ŠKODA USC 660 MW UNIT Feed water tank dia 4 m length 21,5 m Weight 120 t Capacity 250 m 3

41 ŠKODA USC 660 MW UNIT Feed water tank

42 ŠKODA USC 660 MW UNIT TG 660 MW

43 ŠKODA USC 660 MW UNIT TG 660 MW

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52 ŠKODA USC 660 MW UNIT Thank very much you for your attention. Questions, please.